Battery pack



FIG. 1 is a first end plan view of a battery pack showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a second end plan view thereof. 

The ornamental design for a battery pack, as shown and described. 